handling for AS is case sensitive

[lsmith77]

reported by @chirimoya

https://github.com/phpcr/phpcr-utils/blob/master/src/PHPCR/Util/QOM/Sql2ToQomQueryConverter.php#L109

[dbu]

is this now fixed? i see that both checks use a strtoupper on the token:

https://github.com/phpcr/phpcr-utils/blob/master/src/PHPCR/Util/QOM/Sql2ToQomQueryConverter.php#L142
https://github.com/phpcr/phpcr-utils/blob/master/src/PHPCR/Util/QOM/Sql2ToQomQueryConverter.php#L840